Remove WebXR from disabled feature list

Fixes brave/brave-browser#8424

Author: bsclifton

app/brave_main_delegate.cc

@@ -179,8 +179,6 @@ bool BraveMainDelegate::BasicStartupComplete(int* exit_code) {
       features::kNotificationTriggers.name,
       features::kSmsReceiver.name,
       features::kVideoPlaybackQuality.name,
-      features::kWebXr.name,
-      features::kWebXrGamepadModule.name,
 #if defined(OS_ANDROID)
       feed::kInterestFeedContentSuggestions.name,
       translate::kTranslateUI.name,

app/brave_main_delegate_browsertest.cc

@@ -53,8 +53,6 @@ IN_PROC_BROWSER_TEST_F(BraveMainDelegateBrowserTest, DisabledFeatures) {
       &features::kNotificationTriggers,
       &features::kSmsReceiver,
       &features::kVideoPlaybackQuality,
-      &features::kWebXr,
-      &features::kWebXrGamepadModule,
       &features::kLookalikeUrlNavigationSuggestionsUI,
   };